IMHO he is tends to favour Nvidia hardware in his reviews.
More benchmarks from owners please!
Well there's that and the fact nvidia are never done sending him free stuff. He has 4 titan x cards, 3 in his pc and one on stock cooling he seems to use in review comparisons. Pretty sure he also has a 980 ti amongst others that he got to keep. I'm not even sure how much of his pc he actually paid for, i think the case is about the one thing he bought and i'm not even sure about that.